Objective to observe the expression of Schwann cell derived neurotrophic factor (SDNF) in developing lumber spinal cord of rats.

目的观察雪旺细胞源神经营养因子在大鼠生长发育腰髓中的表达。

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Influence metal plate connection factor of performance have the surface of metal plate and superficial coarse intensity between surface of metal plate and dimension lumber.

影响齿板与规格材粘结性能的因素有齿板的面积和齿板与规格材表面的粗糙程度。

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Conclusion: The changes of lumbar facet joint morphology are results of lumber degeneration but not etiological factor.

结论：退行性腰椎滑脱患者的关节突关节的形态变化是腰椎退行性变的结果而菲其病因。

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Another factor to consider in forecasting lumber prices is the dollar, which has shown strength in the midst of the European debt crisis.

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